A Nintex forms enabled SP2013 installation has started giving error since May 2022 after the security update. ULS log linked to this Microsoft KB article 

The article asks to update web.config, but in the referenced article on updating .config file it says its not recommended to update it directly. Either using supplemental method or programmatic update is what's recommended.

The ULS log error entry is given below

w3wp.exe (0x2024) 0x1CCC SharePoint Foundation Sandboxed Code Service 6k389 High - Invalid type: type=System.Web.UI.Pair; assembly=System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a in SPUserCodeSerializationBinder. Visit https://go.microsoft.com/fwlink/?LinkId=2196531 for more information and to learn how to resolve this error. 5bb166a0-06f3-307e-4f14-bcbac01f85b8

My questions

1. Are there users of Nintex forms on 2013 SP facing the same correlation ID error after May2022 security update?
2. Invalid type error is not from any Nintex assemblies and I couldn't find any entries in web.config for marking Nintex assemblies safe. Where can I find them.
3. Will adding the following to web.config resolve the error
       <AllowedListItems>

           <AllowedItem Name="AllowedSandboxType" Type="System.Web.UI.Pair" />

           <AllowedItem Name="AllowedSandboxType" Assembly="System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

       </AllowedListItems>